Use properties of Fourier Transform to solve the question. The question is in the imgur link below.
I got $f_t$ of $\frac {sin(pi \cdot t)} {pi \cdot t}$ as rectangular pulse with value $1$ from -pi to pi second ft is $e^{-jw}$ from $-2 \pi$ to $2 \pi$. I'm unable to get the resultant of two of them